diff --git a/logger/fields.go b/logger/fields.go
index bd4eb68..41e0059 100644
--- a/logger/fields.go
+++ b/logger/fields.go
@@ -35,16 +35,16 @@ func NewFields() Fields {
 	return make(Fields)
 }
 
-func (f Fields) new() map[string]interface{} {
-	return make(map[string]interface{}, 0)
-}
-
 func (f Fields) clone() map[string]interface{} {
+	res := make(map[string]interface{}, 0)
+
 	if len(f) > 0 {
-		return f
+		for k, v := range f {
+			res[k] = v
+		}
 	}
 
-	return f.new()
+	return res
 }
 
 func (f Fields) Add(key string, val interface{}) Fields {
@@ -84,7 +84,7 @@ func (f Fields) Merge(other Fields) Fields {
 }
 
 func (f Fields) Clean(keys ...string) Fields {
-	res := f.new()
+	res := make(map[string]interface{}, 0)
 
 	if len(keys) > 0 {
 		f.Map(func(key string, val interface{}) interface{} {
diff --git a/logger/interface.go b/logger/interface.go
index 17ada6d..8dfe929 100644
--- a/logger/interface.go
+++ b/logger/interface.go
@@ -125,7 +125,7 @@ func New() Logger {
 	lvl.Store(InfoLevel)
 
 	return &logger{
-		m: sync.Mutex{},
+		m: &sync.Mutex{},
 		l: lvl,
 		o: new(atomic.Value),
 		s: new(atomic.Value),
diff --git a/logger/model.go b/logger/model.go
index dab7809..3d01104 100644
--- a/logger/model.go
+++ b/logger/model.go
@@ -55,7 +55,7 @@ var _selfPackage = path.Base(reflect.TypeOf(logger{}).PkgPath())
 type logger struct {
 	x context.Context
 	n context.CancelFunc
-	m sync.Mutex
+	m sync.Locker
 	l *atomic.Value //current level set for this logger
 	o *atomic.Value //options
 	s *atomic.Value //logrus logger
@@ -144,7 +144,7 @@ func (l *logger) Clone(ctx context.Context) (Logger, error) {
 	c := &logger{
 		x: nil,
 		n: nil,
-		m: sync.Mutex{},
+		m: &sync.Mutex{},
 		l: new(atomic.Value),
 		o: new(atomic.Value),
 		s: new(atomic.Value),